Inductor for shaping parts by pulsed magnetic field pressure

ABSTRACT

An inductor for shaping parts by pulsed magnetic field pressure comprising a concentrator having an axial opening for placing a part to be shaped therein, windings disposed at the outer surface of said concentrator, and a concentrator cooling system arranged outside the zone of allocation of said windings and a deformation affected portion of the part being shaped.

United States Patent Mikhailov et al.

[ July 29, 1975 INDUCTOR FOR SHAPING PARTS BY PULSED MAGNETIC FIELD PRESSURE Filed:

Inventors: Valery Mikhailovich Mikhailov,

Komsomolsky prospekt l0, kv. 150; Lev Timofeevich Khimenko, poselok Pokatilovka, ulitsa Ulyanovskaya, 35, both of Kharkov, U.S.S.R.

Mar. 19, 1973 Appl. No.: 342,799

US. Cl. 72/56 Int. Cl B2ld 26/14 Field of Search 72/56; 29/421 M; 336/60,

References Cited UNITED STATES PATENTS McWhirter 336/60 3,214,511 l0/l965 Franklin 72/56 3,253,443 5/ l 966 Malmberg 3,3l8,l27 5/1967 Astleford, Jr. 3,348,397 l0/l967 Weadock, .lr 72/56 3,383,890 5/1968 Wildi 72/56 3,599,461 8/l97l Astl 72/56 Primary Examiner-Richard J. Herbst Attorney, Agent, or Firm-Waters, Schwartz & Nissen An inductor for shaping parts by pulsed magnetic field pressure comprising a concentrator having an axial opening for placing a part to be shaped therein, windings disposed at the outer surface of said concentrator, and a concentrator cooling system arranged outside the zone of allocation of said windings and a deformation affected portion of the part being shaped.

ABSTRACT 2 Claims, 4 Drawing Figures 'PATENTED 3,896,647

SHEET 1 PATENTED JULZ 9 I975 SHEET INDUCTOR FOR SHAPING PARTS BY PULSED MAGNETIC FIELD PRESSURE The present invention relates to the art of metal pressure shaping, and, in particular, to inductors for shaping parts by pulsed magnetic field pressure.

Known in the prior art are inductors for shaping parts by pulsed magnetic field pressure comprising a cooled concentrator having a radial slot and an axial opening for placing a part to be shaped therein, and a winding arranged at the outer surface of the concentrator. The outer surface of the concentrator may be made smooth, or it may be provided with spiral or annular recesses for laying down winding turns therein.

The concentrator is cooled by passing a cooling agent through passages running near the axial opening where the part to be shaped is placed.

The disadavantage of these prior art inductors resides in the limited surface contacting the cooling agent. This disadvantage does not permit a more intensive use of the inductor due to the concentrator exess heating. Attempts to increase the number of the passages and their diameter in order to enlarge the cooling surface result in lower strength of the-concentrator.

It is an object of the present invention to eliminate the afore-mentioned disadvantages.

It is another object of the present invention to provide a concentrator cooling system having a considerably larger surface contacting the cooling agent than those of prior art inductors.

These and other objects and purposes are attained in a concentrator cooling system arranged in the concentrator body outside the Zone of allocation of the winding a deformation affected portion of the part being shaped.

In particular, it is preferable to make the cooling system in the form of a concentrator portion having an extensively finned surface enclosed in a vessel filled with a cooling agent.

The above solution permits practically an unristricted increase in the concentrator surface contacting the cooling agent to be obtained. As a result, the concentrator heating can be greatly decreased, and the intensity of the concentrator use may be enhanced. The additional advantage'of the above solution is that the concentrator strength is improved due to the enlargemerit of the concentrator inert mass exhibiting resistance to breaking upon the application of pulsed forces.

The invention will now be explained in grater detail with reference to embodiments thereof which are represented in the accompanying drawings, wherein:

FIG. 1 shows an inductor for shaping parts by pulsed magnetic field pressure, and an electrical diagram illustrating its connection to a power supply source;

FIG. 2 is a top view of an inductor for shaping parts by pulsed magnetic filed pressure;

FIG. 3 shows an inductor for shaping parts by pulsed magnetic field pressure having a separation circuit provided in the concentrator, and an electrical diagram illustrating its connection to a power supply source;

FIG. 4 is a top view of an inductor for shaping part by pulsed magnetic field pressure having a seperation circuit provided in the concentrator.

The inductor for shaping parts (FIGS. 1 and 2) consists ofa concentrator l which is a massive turn of good conducting material, and a winding 2 laid down in a cylindrical spiral recess-made at theouter surface of concentrator 1. Concentrator 1 hasaamadialislot 3 along the entire length of the lateral surface and an axial operning wherein a part 4 to be shaped is placed.

Part 4 to be shaped is electricallyinsulated from concentrator l by an insulating dielectric bush 5. Concentrator 1 has a portion A having an extensively finned surface enclosed in a metal jacket 6 forming, together with the surface of portion A of concentrator 1, a vessel for a cooling agent 7. 7

Pipe connections 8 and 9 serve for passing a cooling agent 7 through the vessel. Winding 2 of the inductor is connected with a power supply source which may be a capacitor bank 10, via a controlled switching means 11.

Upon closing of controlled switching means 11, ca? pacitor bank 10 discharges into an inductor winding 2. The pulsed magnetic field of the winding induces an electric current in concentrator 1. This electric current, due to the presence of a radial slot 3, flows around the axial opening of concentrator 1 wherein a part 4 being shaped is placed. The directions of the current flow through concentrator 1 are shown by the arrows in FIG. 2. A pulsed magnetic field deforming a part 4 being shaped is established in the axial opening of concentrator 1 (FIG. 1). When the inductor is repeatedly operated, the zone of concentrator 1 near the axial opening is excessively heated.

The effective cooling of this zone of concentrator 1' is achieved by passing a cooling agent 7 near concentrator portion A having an extensively finned surface.

FIGS. 3 and 4 illustrate one of the embodiments of the inductor for pressure shaping parts with a separation circuit in concentrator 1. Concentrator l of this inductor has no continuous slot along the entire length of its lateral surface, however itis provided with a separation circuit 12 made in the form of a radial opening in the body of concentrator l. The inductance of separation circuit 12 is considerably higher than that of the axial opening circuit of concentrator 1 having apart4 being shaped therein. Therefore, the currents ('shown.:.1- by the arrows in FIG. 3) flowing in separation circuit" 12 are not significant. The construction and principle of operation of inductor of- FIGS; 3 and 4, as to the rest,

do not differ from the construction and principle of operation of the inductor shown. iri,-FIGS JEand 2'.

Winding 2 of the inductor mayrb'e laid down in annular recesses or wound on a smooth outer surface of concentrator l. Concentrato'rL-may be also cooled without the use of a special cooiing agentvby thecoi'rvection heat exchange of the ext nfi yelyfinned surface of portion A of concentratotsl witfri the fiznvironment.

We claim:

1. An inductor for shapingfpartszby pulsed magnetic field pressure comprising a concentrator having an axial opening extending through uteit'slength, a portion of said opening serving to-.reeei$1e:-a pa rt to be shaped therein; a winding forirrducing gurrent in said concentrator and disposed ,on aportiomofi-"the outer side surface of said concentrator around said part of the axial opening with said part to beshaped zplaced therein, the other portion of said outer side surface of said concentrator extending in a radial directiomin the form of fins to ensure cooling of the concentrator through contact with cooling means.

tion of the outer side surface of the concentrator extending in the radial direction isheld' in a vessel filled with cooling means. 

1. An inductor for shaping parts by pulsed magnetic field pressure comprising: a concentrator having an axial opening extending throughout its length, a portion of said opening serving to receive a part to be shaped therein; a winding for inducing current in said concentrator and disposed on a portion of the outer side surface of said concentrator around said part of the axial opening with said part to be shaped placed therein, the other portion of said outer side surface of said concentrator extending in a radial direction, in the form of fins to ensure cooling of the concentrator through contact with cooling means.
 2. An inductor for shaping parts by pulsed magnetic field pressure as claimed in claim 1, wherein said portion of the outer side surface of the concentrator extending in the radial direction is held in a vessel filled with cooling means. 